QR 725 then BR 643 at O'Hare
Doha → Chicago → Anchorage
Timetable, Chicago time
14:30QR 725 from Doha at the gate
11:25BR 643 to Anchorage leaves the gate
20 h 55 apart on the timetable, overnight
BR 643 leaves 20 h 55 after QR 725 arrives on the timetable: more than half a day, so not a connection we count.